The basis for the musical text was Henle's revised edition of Part I published in 1997 and Yo Tomita's revision of Part II (Spring 2007). The eminent Bach scholar Tomita discusses the complicated source situation of Part II in an extensive preface. A detailed commentary rounds off the edition. Both parts of the Well-Tempered Clavier are also available as Henle Urtext editions without fingerings (HN 16) and as study editions without fingerings (HN 9016).